Substance P-like immunoreactive trigeminal ganglion cells supplying the cornea

1984 ◽  
Vol 80 (3) ◽  
pp. 273-276 ◽  
Author(s):  
J. I. Lehtosalo
Keyword(s):  
Substance P ◽  
Trigeminal Ganglion ◽  
Ganglion Cells

scholarly journals Seeding of breast cancer cell line (MDA-MB-231LUC+) to the mandible induces overexpression of substance P and CGRP throughout the trigeminal ganglion and widespread peripheral sensory neuropathy throughout all three of its divisions

2021 ◽  
Vol 17 ◽  
pp. 174480692110240
Author(s):  
Silvia Gutierrez ◽  
James C Eisenach ◽  
M Danilo Boada
Keyword(s):  
Breast Cancer ◽  
Substance P ◽  
Cancer Cells ◽  
Cell Line ◽  
Cancer Cell ◽  
Breast Cancer Cell ◽  
Trigeminal Ganglion ◽  
Breast Cancer Cell Line ◽  
Cancer Cell Line ◽  
The Impact

Some types of cancer are commonly associated with intense pain even at the early stages of the disease. The mandible is particularly vulnerable to metastasis from breast cancer, and this process has been studied using a bioluminescent human breast cancer cell line (MDA-MB-231LUC+). Using this cell line and anatomic and neurophysiologic methods in the trigeminal ganglion (TG), we examined the impact of cancer seeding in the mandible on behavioral evidence of hypersensitivity and on trigeminal sensory neurons. Growth of cancer cells seeded to the mandible after arterial injection of the breast cancer cell line in Foxn1 animals (allogeneic model) induced behavioral hypersensitivity to mechanical stimulation of the whisker pad and desensitization of tactile and sensitization of nociceptive mechanically sensitive afferents. These changes were not restricted to the site of metastasis but extended to sensory afferents in all three divisions of the TG, accompanied by widespread overexpression of substance P and CGRP in neurons through the ganglion. Subcutaneous injection of supernatant from the MDA-MB-231LUC+ cell culture in normal animals mimicked some of the changes in mechanically responsive afferents observed with mandibular metastasis. We conclude that released products from these cancer cells in the mandible are critical for the development of cancer-induced pain and that the overall response of the system greatly surpasses these local effects, consistent with the widespread distribution of pain in patients. The mechanisms of neuronal plasticity likely occur in the TG itself and are not restricted to afferents exposed to the metastatic cancer microenvironment.

Capsaicin and nicotine both activate a subset of rat trigeminal ganglion neurons

1996 ◽  
Vol 270 (6) ◽  
pp. C1807-C1814 ◽  
Author(s):  
L. Liu ◽  
S. A. Simon
Keyword(s):  
Trigeminal Ganglion ◽  
Acetylcholine Receptors ◽  
Ganglion Cells ◽  
Whole Cell Patch Clamp ◽  
Current Voltage ◽  
Trigeminal Ganglion Neurons ◽  
Ganglion Neurons ◽  
Relationship Of ◽  
Current Voltage Relationship ◽  
Voltage Relationship

Nicotine and capsaicin produce many similar physiological responses that include pain, irritation, and vasodilation. To determine whether neuronal nicotine acetylcholine receptors (nAChR) are present on capsaicin-sensitive neurons, whole cell patch-clamp recordings were performed on rat trigeminal ganglion cells. It was found that approximately 20% of the total number of neurons tested was activated by both 100 microM nicotine and 1 nM capsaicin. Other subsets of neurons were activated by only one of these compounds, whereas a fourth subset was not activated by either compound. At -60 mV, the magnitude of the capsaicin-activated currents was about three times larger than the magnitude of the nicotine-activated currents. The current-voltage relationship of the nAChR exhibited marked rectification, such that for voltages > or = 0 mV the current was essentially zero. In contrast, the current-voltage relationship of the capsaicin-activated current was ohmic from +/- 60 mV. These data indicate the existence of subsets of capsaicin-sensitive afferent neurons.

scholarly journals Immunohistochemical evidence for the presence of a vasoactive intestinal peptide, neuropeptide Y and substance P in rat adrenal medulla after heat stress

2012 ◽  
Vol 64 (1) ◽  
pp. 7-13
Author(s):  
Dragana Petrovic-Kosanovic ◽  
Vesna Koko
Keyword(s):  
Heat Stress ◽  
Substance P ◽  
Neuropeptide Y ◽  
Vasoactive Intestinal Peptide ◽  
Adrenal Medulla ◽  
Chromaffin Cells ◽  
Ganglion Cells ◽  
Nerve Fibers ◽  
Acute Heat Stress ◽  
Immunohistochemical Evidence

Immunohistochemistry revealed the presence of VIP-, NPY- and SP-immunoreactivity in the rat adrenal medulla. VIP- and NPY-immunoreactivity was detected in chromaffin and ganglion cells and in nerve fibers, but SP-immunoreactivity was found only in chromaffin cells. After acute heat stress, VIP- and NPY- immunoreactivities in cells and nerve fibers were reduced, probably as a result of the release of these peptides with catecholamines. The absence of SP-immunoreactive ganglion cells in the adrenal medulla suggests that the SP-immunoreactive nerve fibers are extrinsic in origin.

scholarly journals PACAP induces axonal elongation in cultured monkey trigeminal ganglion cells

2010 ◽  
Vol 24 (S1) ◽  
Author(s):  
Emi Nakajima ◽  
Ryan D. Walkup ◽  
Thomas R. Shearer ◽  
Mitsuyoshi Azuma
Keyword(s):  
Trigeminal Ganglion ◽  
Ganglion Cells ◽  
Axonal Elongation
Sign in / Sign up

Export Citation Format

Share Document